A Single-Wire Method of Coupling Interface in Capacitive Power Transfer for Electric Vehicle Wireless Charging System

This paper proposes a new approach of coupling interface configuration on capacitive power transfer (CPT) for electric vehicle wireless charging system. CPT has several advantages in use of wireless charging system for short range application such as electric vehicle. One of the advantages is flexibility of coupling interface. Two-pairs of plate usually used to acquire electric field work in order to deliver some amount of designated power. This paper studies a single-wire coupling interface for EV charging system. Simulation has been done in SPICE software with the consideration of parasitic components appearing in the system. As the result, at 3.3 kW output power delivered, the coupling voltage and chassis voltage were measured at 24,720 V and 114V, respectively. This level is obtained when the coupling and chassis capacitances are 1.1 pF and 442 pF, correspondingly. The values are extracted by the electric field simulation on a normal size car.